How Luxembourgish citizenship by descent works
The eligibility rules for Luxembourgish citizenship by descent, in plain English — who may qualify, what disqualifies, and the legal regimes over time, each cited to its primary statute.
Who may qualify
A qualifying path — via the jure sanguinis route
Requirements
ALL of the following
the applicant has a qualifying descent path (satisfies art7).
- satisfies art7:
- true
the qualifying ancestor must have held luxembourgish citizenship at the moment the applicant was born, passing it down the line by descent. Where the claim runs through more than one generation, a later loss of that citizenship is measured against the birth of that ancestor's own child on the line — the point at which it would have passed down — rather than against the applicant's birth.
- required citizenship:
- luxembourgish
Primary sources
- § Nationality Law of 8 March 2017, Art. 7 — descent through an all-male lineage to a Luxembourg-born ancestor (born within current borders before a rolling cutoff that increments by 1 year each 1 January; ~before 19 April 1948 as of 1 Jan 2026); for applicants born from 1969-01-01, a SINGLE maternal link is permitted only if the mother herself carries an all-male qualifying lineage. Unlimited generational reach (no statutory cap). Art. 7 imposes NO condition that intermediate ancestors did not acquire a foreign nationality: the 2017 law abolished all automatic loss on foreign naturalization (Arts. 55–64 enumerate loss only by renonciation or déchéance), so no naturalization chain-break gate applies (Loi du 8 mars 2017, texte coordonné, Arts. 7, 55–64, 77 — mj.gouvernement.lu official PDF, verified 2026-05-28).
A qualifying path — via the declaration route
Requirements
ALL of the following
ANY of the following
the applicant must be the parent of the qualifying ancestor.
- relationship:
- parent
the applicant must be the grandparent of the qualifying ancestor.
- relationship:
- grandparent
ANY of the following
the qualifying ancestor must have held luxembourgish citizenship at the moment the applicant was born, passing it down the line by descent. Where the claim runs through more than one generation, a later loss of that citizenship is measured against the birth of that ancestor's own child on the line — the point at which it would have passed down — rather than against the applicant's birth.
- required citizenship:
- luxembourgish
the qualifying ancestor has a qualifying currently luxembourgish (confirmed). If this fact is absent, the rule treats it as not applying (rather than asking for more information).
- confirmed:
- true
ALL of the following
Must NOT be true
the qualifying ancestor has a recorded citizenship never held such that country = luxembourgish. If this fact is absent, the rule treats it as not applying (rather than asking for more information).
- country:
- luxembourgish
the qualifying ancestor has a recorded citizenship held such that country = luxembourgish.
- country:
- luxembourgish
Primary sources
- § Nationality Law of 8 March 2017, Art. 23 (Case 1) — acquisition by option via a parent, ADOPTIVE PARENT, or grandparent who IS OR WAS Luxembourgish (and the nationality was not passed on); no language or residence requirement; mandatory in-person signature before a Luxembourg civil registrar (proxy NOT permitted) (Guichet.lu confirmed) [LU-04, LU-05]
See how these rules apply to your family
The free eligibility check walks your own lineage through these rules — no account, no card, about two minutes.
Check your Luxembourgish eligibility